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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 296.7 | $ 320.2
Equity Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 162.8 | 179.2
Fixed Income Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 113.6 | 116.0
Real Estate [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 2.3 | 2.4
Other [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 18.0 | $ 22.6

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